“It was somebody who knew what they were doing,” Fullerton Police Department Lt. Robert Bastreri told the paper.

According to police, the robbers arrived just before midnight to Yokohama Tires, located at 601 South Acacia Ave., and caught two security guards by surprise, holding them at gunpoint.

It was unclear from the description exactly how they did it -- apparently the tires were already in trailers, just waiting to be hauled away -- but whatever the case the men backed trucks up to trailers and “simply drove away with the goods,” the Register reports.

(Yokohama Tires is a huge international corporation with its U.S. headquarters in Fullerton, so it may keep trailers there full of tires to be shipped around the region.)

Police have few leads, and are asking anyone with information to call (714) 738-6800.